Back-feed mechanism for type-writers.



M.' B. SARGENT. BACK FEED MEGHANISM FOR TYPE WRITERS. APPLICATION FILED AUG. 23, 1909.

954,138 Patented Apr.5.1910

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Mnasia'iitnis'. SABGENT, oF nommen;- ILL'INoi's, AssiGNon To EMnnsoNvrYnEWnirEn I Salies. f

Y Be it known*y that LMAnsHLL Bf. SAR- y Garriga citizenof thenited States, resid of' at Monience, in the county-of Kankakee and o o., or CHICAGO, ILLINOIS;

State of Illinois, have invented' certain 'new andfjiisefiil Im nrovein'ents vin Back-V Feedl Mechanism for' ypefWriters, 'obfvvhiclrthe tfll'owing is a specification'.

A*Th back-feed mechanism of the present )invention is applied toa typewriter having in escapenient'rack, which is pivoted to the' carriage frame in a 'suitable manner -to per?v j init the rack to be" swung away v#from and out` of` engagement jvviththe escapement dogs; and thev object oli the presentf in- :yent'ion is to' so'ccnstriictj the back-feed that it will hold the rack against such swinging 1 action during the. operation of the back- .3 feeding, thereby preventing a sudden re lease of the carriage, which might take place 'itt-he rack were accidentally sii'rungoiit of itsnormal position.

" v l Another. objectlof tlie'invention'i-s to so arrange the back-feeding dog that it will not .255`

the rack when such movement is. desirable l y i 7 vprevents the nioi-ementiof'fthe 'dog on the forward or backfeedingino'v` ierit ,of thesaine tinie, allows freedom of moven-ient to the dog on the reverse movement 'of the bll'crank lever,

interfere with al disengaging movementv of ,column spacing.

'Fii'iltherobjects will appear from a de- 'taileddescription ofthe invention, Which consists in the lfeatures of construction and combination of parts hereinafter v'described :and claimed.

- .1 *Inl the drawings, Figure 1 is a cross sec- .iV-tionalview 'ofthe frame and those portions otthe.typewriter .having tov do vWith the '-.present invention; Fig.- 2 a ldetail showing theback-feeding-dog and-actuating lever,-V

together vwith other associated parts; and

`Fig. 3 an enlarged detail showing the act- The invention is applied to a typewriter,

Ving face of ythe backfeeding dog.

which is built into a frame, having side ivalls 4," a -rear Wall 5, a front wall 6, and a 4to Wall: o r iloor'7 The-typewriter is provi ed vvith `a carriage'fraine 8,' which jour-V nals a platen 9. and furnishes afsupport for Wears 11 pivoted to theends'of ythe carriage -franie in such a manner as to perinit an escapement rack 12 to be swung rearwardly in the direction otl the arrow when 1t is de-A sired o'throw Athe rack out of engagement BACK-.Friniimnoiiansm Fon 'rYrE-Wni'ransf'f specificati@ of Lettersrate'nt. Patent@ application aleen-gust 2a. iaoa serial no. 2514.217. i'

A operon/Arion or MA1- Nag and associated parts isf" daititedtv to norman-ner.

Theback-feeding inechanisi comprises a tion-outside of the rearfa'c'e of the-'rack 12, 'when the tooth `is tliroivn'into back-feeding engagement with teeth ofv the rack,y so that during the period of'oplerationg'theracl; will action in .case fno Uuardffwer-e afforded by theupperend 17 o? the' ydog.`

lever'19, which is pivote'd at' itsE elbow 20 ,to a suitable fixed.- bracle't21,and'fa'stop pin v22 isprovided on the vhell"' cranlrlever inside .of the' arm 14 of the dog ivhicli'"stop pin .hell crank lever, and, Vat

so that the dog on each reverse `vmovement vpivoted to the rear endf-o key lever 27 Wliichis-iil convenient reach of the operatlr;"fi-V ment with the escapeni'ent dogs', and a suitnient of the release carriage at designated columnpositions, but siich mechanism ina-y ,nially travel from right toleftintheiisual "dog 13, which is bifurcate'dfat lijiiver end,

i i. The -dogis -pivoted byineansota pinor' stud-18 to 'the upperI end "of a Ibell crank' 'ed to the.'

`-Ward 'end and terminates in a" key28 v vithin' above the'tooth s uiiicientlyfto occupy a` posibe held against. lateral v niovenient, which mightA be' occasioned byfltheback-"feeding will be permitted toride iindri a tooth, or

transmission lever 26, and-whichin turn is back-feeding It Will be understoodtl'iat the above inechj anisni cooperates with suitable mechanism or i means for swinging the rack `out of engageable' stop inechanisnrfor resting the move? be of any suitable character, and the present inventlon 1s not concerned with the nature .or details of such mechanism, which is only referred to to indicate thel desirability of Iproviding a pivotally mounted rack of the character described.

In use, `during the normal -operation of Athe machine, the back-feed dog will lie out imparts a downward movement to the rod 25 and throws `the uppenarm of the bell crank lever from left to right, as indicated by the arrow in Fig, 2. This movement raises the guard edge 17 of the dog into position to bear against the outer face 17'of the escapement rack and brings the upper end of the tooth 16 into engagement with one of the teeth of the escapement rack, so that a continued movement of -the Ibell crank lever and the dog will impart a backfeeding movement to the rack,'which movement will, of course, be imparted to `the c'arriage. With the completion of such movement, the key lever will be released and the parts returned to their initial positions, during which movement the dog will be enabled to ride under the escapement rack teeth by' the swinging or turning of the dog against the tension of the spring 23, which is so depressed as to permit the rack to swing in the necessary direction, and, at the same time, the stop pin 22 will hold the dog rigidly during thebackfeeding movement. If the guard edge 17 were omitted, there would be a tendency to swing the rack upwardly and outwardly during the back-feeding action, so that the rack might be thrown out of engagement with the escapement dogs and released therefrom, allowin the carriage to be accidentally advance( which would cause inconvenience and trouble for the operator.

I claim:

1. Invtypewrter back-feed mechanism, in combination with a movable rack bar, a back-feed dog provided with a guard edge or lip positioned to enga e the face of the rack, and further provi ed with a tooth adapted to engage with the teeth of the rack, and means for actuating the dog, to

and 4prevent swinging movement thereof, af

ing the dog, substantially as described. l 4. In typewriter back-feed mechanism, in

impart back-feeding movements thereto,

substantially as described.

2. In typewriter back-'feed mechanism, in

combination with a :movable rack barY a back-feed dog provided with a guard or lip positioned to enga e the face hof' e rack, and further provi ed with a tooth adapted to engage wlth the teeth of the rack, .65

a bell crank ever to which the 'dog is pivoted, means for holding the dog rigidly against movement in one direction and' adapted to permit movement in the .oppo` site direction, 'and means ,for actuating the) bell crank lever, substantially as descrl'bedlj 3. In typewriter back-feed mechanism, 1n combination with a pivoted rack bar, a dog provided with a guard lip, normally out of line of swinging movement of the rack bar, and adapted, when the dog is thrown in to back-feeding position, to bemoved into position'tobear against the face of the rack bar I tooth on the dog adapted to engage with the teeth on the rack bar, and means for actuatcombination with a pivoted rack bar, a dog provided with a guard lip, normally -out of line of swinging movement of the rack bar,

and adapted when the'dog is thrown into back-feeding position', to be moved into position to bear against the face of the rack .bar

and prevent swinging movement thereof, a

tooth on the dog adapted to engagewith the teeth on the rack bar, 'abell crank lever towhich the dog is pivoted, means for permit. ting the dog to move freely in one direction and adapted to hold the dog against movement in the opposite direction, and means for actuating the bell crank lever, subst-antially as described.

5,. In typewriter back feedl mechanism, in combination with'a rack bar adapted to beV moved into and out of engagement with Vthe escapement devices, aback feeding device normally out of'engagement with the rack bar and comprising adog rovided with a tooth for engaging the'racr bar, and a lip for preventing ateral movement of the-rack bar when the back feeding device is moved into and out of engagement with the rack bar, substantially as described.

MARSHALL B. SARGENT.

Witnesses:

THos. A. BANNING, Jr., FRANCES M. FROST. 

